JPH01209837A - Transmission method in distributed multiplexing/switching system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmission method in a ring network,
In particular, the present invention relates to a transmission method in a distributed multiplexing/switching system that is suitable for use when configuring a distributed multiplexing/switching system by connecting a plurality of multiplexers, switching devices, etc. via a ring network.

[Conventional technology]

As a conventional technology related to a distributed multiplexing/switching system configured by accommodating a ring network multiplexing device, switching equipment, etc., for example, Nikkei Data Pro, Datacom Bulletin Board (1
976, 4) The technique described on pages 5 and 6 is known.

This type of conventional technology accommodates in a ring network a transmission area (time slot) for the capacity of a digital multiplex interface between devices accommodated in the ring network and terminal devices, telephones, etc. accommodated in the device. This method employs a method of fixedly allocating information to transfer information between devices.

This type of conventional technology will be explained below with reference to the drawings.

Figure 2 shows distributed multiplexing using a general circular network.
FIG. 3 is a diagram showing the overall configuration of a system that is a switching system and to which the present invention is applied. 1 is a diagram illustrating a transmission format of a digital multiplex interface according to technology; FIG. In FIG. 2, 201 is a data terminal device, 202 is a private branch exchange (PB
X), 203 is a computer, 204 is a data station (
DST), 205 is the control station (C3
T), 206 is a loop transmission line, and 207 is a multiplexer (
MPX).

The system shown in FIG. 2 includes one control station C3T205 and a plurality of data stations D as transmission devices in a loop transmission line 206 using an optical fiber or the like.
ST204 is connected, and each station is also connected to various data terminal equipment 201, private branch exchange PBX202,
A computer 203, a multiplexer MPX 207, etc. are connected to each other.

In the system shown in FIG. 2, each of the control station C3T205 and the data station DST204 multiplexes and imports data from a plurality of data terminal devices 201, private branch exchanges 202, and computers 203 housed in their own station controllers, and The converted data is further multiplexed and sent out on the loop transmission line 206,
In addition, data communication between the devices accommodated in each station is achieved by capturing the multiplexed data addressed to the own station on the loop transmission line 206 and distributing it to each device accommodated. Is going.

-a, when communication is performed by connecting private branch exchanges to each other without going through the network system as described above,
Communication between exchanges is performed using a transmission method standardized by the TTC called the TTC2M interface, and when such a private branch exchange is connected to the system shown in Figure 2, this private branch exchange PBX 202 and this Control station C3T205 or data station 2 housing private branch exchange PBX202
04 is made through the TTC2M interface.

This interface will be explained below with reference to FIG.

This interface consists of 32 time slots (T
Voice or data is transmitted by repeating information called a frame with a period of 125 μs consisting of S). Of these 32 time slots,
TS No. 1~15° 17~31 time slots are:
The time slot with TS No. 0 is a time slot for signals, and various types of control information are carried therein. And each time slot is
It consists of 8 bits. Therefore, this interface can multiplex and transmit information for 30 channels, and the signal time slot has a meaning in units of eight frames. Of the 8-bit signal time slot, the F bit of bit No. 001 is a violation code for frame synchronization, and the MF pit of bit No. 2 represents a multi-frame unit of eight frames. , bit No. 083, S bit, is a device alarm bit, and bits No. 4 to 8 notify the presence/absence of each channel No. 1 to 30 information for each multiframe. In this interface, each channel used for voice or data transmission has a transmission rate of 64 Kbps, with a total of 2
, 048 M bps.

Such an interface allows private branch exchange PBX
Control station C3 connected to 202
In order to transmit information with other stations accommodated on the same loop transmission path 206, the T205 or data station DST204 further multiplexes the above-mentioned frame into the loop transmission path or transfers it from the transmission path. Perform the import operation. The loop transmission line 206 has an interface faster than the 7702M interface described above, and each station connected within the loop transmission line 206 uses this loop transmission for information transmission with other stations. One time slot in the high speed interface on path 206 is assigned. Therefore, when transmitting information between stations accommodating the PBX 202 having the 7702M interface described above, the stations transmit the signal frames in the 7702M interface as they are, and allocate them on the loop transmission path 206. It operates in such a way as to load the current time slot or take in that time slot.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not depend on the number of telephones housed in devices such as the control station C3T205゜data station 204 connected to the loop transmission path,
If the number of terminal devices is small compared to the multiplicity of digital interfaces for information transmission between these terminal devices and the station accommodating them,
This method does not take into consideration the fact that the number of unused channels in the time slots allocated to the loop transmission path 206 increases, and this has the problem of reducing the transmission efficiency in networks such as the loop transmission path. That is, for example, in the case of a station that accommodates the private branch exchange 202 described above, this station can transmit information for 30 channels from telephones accommodated in the private branch exchange 202 by putting it on a loop transmission path. However, if the number of telephones accommodated in the private branch exchange 202 is small, or if the amount of traffic between the telephones accommodated and other stations is small, some of the 30 channels handled by this station are always If only one channel is used, it is sufficient for the information transmission at this station, and there will always be an empty channel. These empty channels cannot be used by other stations, and as a result, time slots with many empty channels are placed on the transmission path 206, reducing the transmission efficiency of the transmission path 206. Put it away.

The purpose of the present invention is to solve the problems of the prior art described above,
The object of the present invention is to provide a transmission method in a distributed multiplexing/switching system that does not reduce transmission efficiency in a network.

[Means to solve the problem]

According to the present invention, the above object is to combine effective channels in local multiplexing information in a plurality of stations connected to a network such as a loop transmission line, thereby dividing time slots on a network by a plurality of stations. This is achieved by allowing the local multiplexing information of the own station to be separated from the shared and conversely shared time slots.

[Effect]

The effective portion of the locally multiplexed information at each station is transferred to a predetermined position within a certain time slot circulating around the loop transmission path and sent to another station, for example, a center side station. On the other hand, the multiplexed information from the center station is transferred as is to the time slot on the loop transmission path. Each local station operates to capture information only at a predetermined location within a time slot. As a result, the number of time slots on the loop transmission path used for information transmission between the center station and multiple local stations can be limited to one, and the multiplexed information of each local station controller can be loop-transmitted. Compared to the case where one time slot on the road is allocated, the information transmission efficiency on the loop transmission path can be increased.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transmission system in a distributed multiplexing and switching system according to the present invention will be described in detail below with reference to the drawings.

Figure 1 is a diagram explaining the basic concept of the present invention, and Figure 4 is a diagram explaining the basic concept of the present invention.
FIG. 5 is a diagram explaining the information transmission format on the loop transmission path, FIG. 6 is a block diagram showing the configuration of the station connected to the loop transmission path, FIG. 7 is a block diagram showing the configuration of a station connection module for connection between a station and a private branch exchange PBX. Figures 1 and 6
7, 101 is the parent PBX, 102 is the child P
BXA, 103 is child PBXs, 601 is repeater, 60
2 is a frame generation control unit, 603 is a station bus control unit, 604 to 609 are buses, 610 is an optical/electrical converter, 611 is an electric/optical converter, 612 is a code demodulator, 61
3 is a code modulator, 614 is a control section, 620 is a control circuit, 621 is a synchronization detection section, 622 is a frame-circular delay compensation circuit, 623 is a frame generation circuit, 624, 6
31.635 is a selector, 630 is a control microcomputer section,
632 is a synchronization detection unit, 633 is a communication channel control circuit,
634 is a delay circuit, 701 is a station connection module, 710 is a data reception circuit (RCV), 712 is a transmission/reception control circuit (ACCESS CTL), 713 is a data transmission circuit (DRV), 711, 714 is a memory (MEMORY), 7i5, 716 is a memory control unit (MEMORY CTL), 717 is a 2M interface transmitting unit (2MI/FS), and 718 is a 2M interface receiving unit (2MI/FR).

The present invention is applied to the system shown in FIG. 2 described above, and in the following explanation, the present invention is applied to the system shown in FIG. It shall be applied to mutual information transmission. FIG. 1 is a diagram illustrating details of the present invention in this case, and is effective for accommodating the 7702M interface shown in FIG. 3 described above in a network.

The network shown in FIG.
01. A child (local) PBXA 102 and a child (local) PBXm 103 are accommodated. And between each PBXIOI~103 and each station,
Connected by the TCM2M interface mentioned above,
One frame of this TCM2M interface is multiplexed into one time slot on the loop transmission line 206. At that time, information transmission between the parent PBXIOI and the child PBXA 102 is performed using, for example, 15 channels, channels N001 to 15, out of 30 channels in one frame, and information between the parent PBXIOI and the child PBXI is Transmission is performed using, for example, 15 channels numbered 16 to 30 out of 30 channels within one frame.

Therefore, one time slot on the loop transmission path 206 is divided and used for information transmission between the parent PBX 101 and child PBXA 102, and information transmission between the parent PBXIOI and child PBXm 103. .

The format shown in FIG. 4 explains such a transmission method using an actual 7702M interface. In FIG. 4, channels No. 1 to 15 of the 7702M interface are connected to child PBXA 102 using
o, 16 to 30 are assigned to the child PBX 1103. Information transmission between the parent PBXIOI and the loop transmission line 206 is performed using the format using the 70M2M interface shown in FIG.
It is copied to the empty signal time slot of No. and IS, and is transmitted on the designated time slot of the loop transmission path 206. The child PBXA 102 receives the designated time slot sent on the loop transmission path 206, and receives the signal time slot with TS No. 0 and the TS
No.

1-15 Capture channels 1-15 and ignore subsequent channels. In addition, the transmission information from the child PBXA 102 is sent to the parent PBXA using only the channels of TS No. 1 to 15.
transmitted to the IOI. When the child PBx, 103, receives the specified time slot, TS No., 1
The contents of the empty signal time slot of 6 are TS No.
Return to signal time slot 0, TS No. 1~
15 channels 1 to 15 are ignored, TS No. 17
~32 channels 16-30 are captured. Also, child PBX
The transmission information from +s 103 is TS No. 17
Parent PBX t using only channels 16-30 of ~32
transmitted to ot.

According to the above method, the interface between the station accommodated in the loop transmission line 206 and the private branch exchange PBX connected to this station is 70M2M.
This can be done by a format using an interface, and one time slot in the loop transmission path 206 can be used for information transmission between 2fa stations. Further, in the above description, one time slot on the loop transmission path 206, that is, the frame at the 7702M interface shown in FIG. From the multi-frame structure of the signal time slot shown in FIG. 3, it is effective to use five channels as a unit of division and to divide so that an integral multiple of channels are allocated to each station.

Next, information transmission within the network using the loop transmission line 206 for transmitting information between the private branch exchanges 41PBXs 202 as described above will be explained.

The transmission format within the loop transmission line 206 used in the embodiment of the present invention is shown in FIG.

As shown in FIG. 5, the loop transmission path 206 includes one frame header FH and 47 time slots TSI.
TS47 to TS47 are loaded one after another, and information is transmitted between the stations connected to the loop transmission line 206. These frames are each made up of eight blocks and are configured into a multi-frame. The frame header F)l and time slot TS in each frame are each composed of 32 bytes, and each time slot TSI-TS47 has a loop transmission line 20
Information between stations connected to 6 is carried. In addition, the frame header FH is divided into 2 bytes, each of which has a synchronization code FSY for synchronizing the frame.
Information such as N, a code CMD indicating the type of frame, a multi-frame counter FN1, a frame counter (counter' larger than 8) for not accommodating the low-speed end, MFU, MFL, etc. are carried. Each time slot from T31 to TS47 is loaded with a frame according to the present invention as explained in FIG.
It is used for information transmission between stations connected to 6, that is, information transmission between data terminal equipment, switching equipment within a computing facility, etc. Therefore, each of these time slots has a transmission rate of 2,048 M bps, and the loop transmission line 206 as a whole has a transmission rate of 98.
It has a transmission speed of 304 Mbps.

Next, the configuration of the control station 205 and data station 204 connected within the loop transmission path 206 will be explained with reference to FIG.

As shown in FIG. 6, the control station 205 includes two repeaters 601 and a frame generation control section 60.
2, a station bus control section 603, and a plurality of pass lines 604 to 609. Note that the data station includes the frame generation/control unit 60 in FIG.
2, the following explanation will be given only regarding the control station. The repeater 601 has a loop transmission line 206, one of which is in use, and the other is a backup loop transmission line.
are connected to an optical/electrical converter 610, an electrical/optical converter 611, a code demodulator 612, and a code modulator 61, respectively.
3 and a control section 614. In this repeater 601, received data from the loop transmission line 206 to the station is received and demodulated via an optical/electrical converter 610 and a code demodulator 612, and output to the local input bus 604. Output data to 206 is output from local output bus 605 via code modulator 613 and electrical/optical converter 611.

The frame generation control unit 602 is a control unit that generates frames to be sent to the loop transmission path 206 and compensates for their delays, as explained in FIG. It is composed of a generation circuit 623, a selector 624, a control circuit 620, and the like. Further, the station HAS IIJlff1 section 603 is a control section that controls data input/output with devices connected to this station, and includes a selector 631, a synchronization detection section 632, a communication channel control circuit 633, and a delay circuit 634.
, a selector 635, a microcomputer section 630 that controls the rope and the pass line, and the like.

These control units 602 and 603 operate as follows.

First, when a station is started up, if there are a plurality of control stations in the loop transmission path 206, competition control is performed among them, and the station with a higher priority starts up as the master control station. Thereafter, the frame generation circuit 623 in the frame generation control unit 602 generates the frame header FH as explained with reference to FIG.

A frame consisting of time slots TSI to TS47 is generated. This generated frame is sent to the selector 624,
631. The signal is sent to the loop transmission line 206 via the delay circuit 634, selector 635, local output bus 605, and repeater 601. This frame is the loop transmission line 2
After going around 06 and returning, the amount is stored in the memory in the -cyclic delay compensation circuit 622, and the amount stored in this memory is adjusted so that exactly eight frames are present on the loop transmission path 206. As a result, eight frames always exist on the loop transmission path 206 unless some kind of failure occurs on the transmission path. Furthermore, among the received frames, the received frames that should be received by the equipment housed in this station are input from the local bus 604 to the IN bus 607 via the selector 631.
Devices connected to this station can receive data from this IN bus 607. Furthermore, output data from devices connected to this station is output to the OUT bus 608, and is therefore sent to the loop transmission line 206 via the selector 635, local output bus 605, and repeater 601. These data input/output controls are controlled by the CTL bus 609 and M bus 60.
6.

A private branch exchange PB is installed in the station configured as described above.
The configuration of the station connection module when X is connected is shown in FIG. 7, and will be described below.

The private branch exchange PBX connected to the station connects the aforementioned IN bus 607, OUT bus 608, and CT via the station connection module 701 as shown in FIG.
r, bus 609 and M bus 606. This station connection module 701 is connected to the IN bus 60
a data receiving circuit (RCV) 710 that receives data from other stations via the CTL bus 609, M
A transmission/reception control circuit (ACCESS CT) receives control signals from the Hass 606 and controls data reception and transmission.
L) 712, a 2-port memory (MEMORY) 711 that temporarily stores received data, a memory control unit (MEMORY CTL) 715 that generates an address for this memory 711 and controls the memory 711, and sends the received data to a private branch exchange. The transmitter of the 2M interface to transfer (
2MI/FS) 717 and a 2M memory 714 that receives data sent from the private branch exchange to other stations.
An interface reception unit (2MI/FR) 718,
A two-board memory (MEMORY) 714 that temporarily stores data from the receiving unit 718, and a memory control unit (MEMORY CTL) 716 that controls this memory 714.
Then, a data transmission circuit (DR) transfers the data in this memory 716 to the OUT bus 608 in order to send it to another station via the station control unit 603 described above.
V) 713.

This data station connection module 701 exchanges information with the connected private branch exchange PBX in a format using a 7702M interface,
It also exchanges data with the station control unit 603 via the bus.

Since the embodiment of the present invention described above is configured as described above, the connections between the private branch exchanges housed in the stations connected to the loop transmission line 206 are made as shown in FIG. 7702M interface format, and multiple interconnections can be made by sharing a single time slot in the loop transmission line 206.

The embodiment of the present invention described above is an example in which a switching system is constructed by applying the transmission method according to the present invention for connection between private branch exchanges housed in stations connected to a loop transmission line. The invention can also be applied to a multiplex system that includes a multiplexer instead of a private branch exchange and accommodates a large number of data terminals in the multiplexer.

〔Effect of the invention〕

As explained above, according to the present invention, one time slot serving as one multiplexing unit in a loop transmission path is used to connect multiple sets of connections between stations accommodated in the loop transmission path. so it can be shared for
It is possible to prevent a decrease in transmission efficiency in the loop transmission path and to effectively utilize the loop transmission path.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the basic concept of the present invention, and FIG. 2 is a diagram showing the overall configuration of a distributed multiplexing/switching system using a general ring network and to which the present invention is applied. FIG. 3 is a diagram showing a transmission format of a digital multiplex interface according to the prior art between devices accommodated in a ring network and between the device and a plurality of terminal devices accommodated in the device, and FIG. FIG. 1 is a diagram explaining the transmission method according to the present invention used, FIG. 5 is a diagram explaining the information transmission format on the loop transmission path, and FIG. 6 is a block diagram showing the configuration of the station connected to the loop transmission path. 7 are block diagrams showing the configuration of a station connection module for connection between a station and a private branch exchange PBX. 101...---Parent PBX, 102--
---Ichiko PBXA. 103・----Ichiko P B X, , 20 L=
------ Data terminal device, 202 --- Hitotsubashi switchboard (PBX), 203 --=...- Computer, 204 --- Data station controller (DST),
205...--Control station (C
8T), 601--Repeater, 602--...
---Frame generation system m section, 603 --- Station bus control section, 604 to 609 --- Bus, 61
(L-------optical/electrical converter, 611...
- Electrical/optical converter, 612-...- Code demodulator, 6
13...-code modulator, 614--control unit, 620--control circuit, 621--synchronization detection unit, 622--frame cyclic delay compensation circuit , 623... Frame generation circuit, 624°63
1, 635-----° selector, 630...
--- Control microcomputer section, 632 --- Synchronization detection section, 633 --- Communication channel control circuit, 63
4--Delay circuit, 701...--Station connection module, 710---1--Data reception circuit (RCV), 712--1 Transmission/reception control circuit (ACCESS CTL), 713...-Data transmission circuit (DRV), 711.714--Memory (MEMORY), 715.716-----
---Memory control unit (MEMORY CTL), 7
17-・-・-・2M interface transmitter (2M
I/FS), 71B---=2M interface receiving section (2MI/FS). party figure 6 figure 7 figure

Claims (1)

[Claims] 1. A plurality of distributed terminals and a local multiplexing/switching device that multiplexes or exchanges information of these terminals;
At least one master multiplexing/switching device that multiplexes or exchanges information from these local multiplexing/switching devices, a plurality of transmission devices that accommodate each of these multiplexing/switching devices and transmits information, and a transmission device. In a distributed multiplexing/switching system consisting of loop transmission lines connecting each other in a ring shape, the multiplexing/switching devices are connected to each other by a digital multiplexing interface having a frame structure with a constant period, and at least one transmission device is , a transmission time slot having the same transmission capacity as the multiplex interface is generated, a plurality of these time slots are sequentially circulated on a loop transmission path, and each transmission device is allocated a predetermined area within the predetermined time slot. , receives the information in the area, stores this received information in a predetermined area in the multiplexed information, and sends it to the multiplexing/switching device, and at the same time, the information in the predetermined area in the multiplexing information from the multiplexing/switching device, A transmission method in a distributed multiplexing/switching system characterized by insertion into a predetermined area within a predetermined time slot. 2. The digital multiplex interface is characterized in that the digital multiplex interface is configured to create a multiframe with eight 125 μs frames each having two signal time slots and 30 voice or data time slots. A transmission method in a distributed/switching system according to claim 1. 3. The transmission device that generates the transmission time slot adjusts the cycle in which the time slot circulates around the loop transmission line so that it is the same as the multi-frame cycle of the digital multiplex interface. A transmission method in the distributed multiplexing/switching system described in Scope 2. 4. The predetermined area of the time slot allocated in advance to each of the transmission devices is composed of an integer multiple of 64 Kbps and 5 channels as a division unit. Distributed multiplexing and
A transmission method in a switching system. 5. Of the two signal time slots in the multiplexed information transmitted in the time slots on the loop transmission path,
Transmission in a distributed multiplexing/switching system according to claim 2, 3, or 4, characterized in that empty signal time slots are used for transferring individual line control information in the digital multiplexing interface. method.